The first peoples in the Americas were Europeans who arrived over 19,000 years ago, were hunting seals and auks along the permanent ice sheet that covered a much reduced in size Atlantic ocean. They arrived to now drowned lands at the Grand Banks off Newfoundland and moved southeastward, probably follwing sea birds back to the main land.
The Meadowcroft Rockshelter, in Western Pennsylvania, is only a few miles from the Ohio border, and say a few hundred from the Ohio-Indiana border. They didn't say where in Ohio the sloth bone was found. The earliest human habituated (tools, charcoal from firepit) level found in Meadowcraft was 19,000 years ago.
The sloth bone is presumed to be 16,500 years old, so this means the Meadowcroft people or descendants were around that area for almost 3,000 years before killing or butchering the sloth (folks, it could have died of natural causes or other predatory action and the humans found it)!
I can't see a way at all that this proves Asians settled the Americas, yet Greenfield says it does. I personally believe they dare not say Europeans were here first because of political correctness and how that would be “cultural chauvinism”.